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The pH of venous blood is only slightly more acid than the pH of arterial blood because (1) CO2 is a weak base (2) There is no carbonic anhydrase in the venous blood (3) The H+ generated from CO2 and H20 is buffered by HCO3-; in venous blood (4) The H+ generated from CO2 and H20 is buffered by deoxyhemoglobin in venous blood?
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The pH of venous blood is only slightly more acid than the pH of arter...
PH of Venous Blood vs Arterial Blood
The pH of venous blood is only slightly more acidic than arterial blood due to several factors.
Carbon Dioxide as a Weak Base
One of the main reasons is that carbon dioxide (CO2) is a weak base. When CO2 is dissolved in water, it reacts with water to form carbonic acid (H2CO3), which then dissociates into bicarbonate (HCO3-) and hydrogen ions (H+). The H+ ions make the solution more acidic. However, because CO2 is a weak base, it only produces a small amount of H+ ions and therefore has a negligible effect on the pH of the blood.
Buffering Capacity of HCO3-
Another factor is the buffering capacity of bicarbonate ions (HCO3-). HCO3- is a weak base and can combine with H+ ions to form carbonic acid, which then dissociates into CO2 and water. This process helps to remove excess H+ ions and maintain a relatively constant pH. In venous blood, the H+ ions generated from CO2 and H2O are buffered by HCO3-, which helps to maintain the pH of venous blood similar to arterial blood.
Deoxyhemoglobin as a Buffer
Finally, deoxyhemoglobin in venous blood also acts as a buffer. When hemoglobin is not bound to oxygen, it can bind to H+ ions and therefore help to remove excess H+ ions from the blood. This process helps to maintain the pH of venous blood similar to arterial blood.
Conclusion
In summary, the pH of venous blood is only slightly more acidic than arterial blood due to the weak base nature of CO2, the buffering capacity of HCO3-, and the buffering capacity of deoxyhemoglobin. These factors work together to maintain a relatively constant pH in the blood.
The pH of venous blood is only slightly more acidic than arterial blood due to several factors.
Carbon Dioxide as a Weak Base
One of the main reasons is that carbon dioxide (CO2) is a weak base. When CO2 is dissolved in water, it reacts with water to form carbonic acid (H2CO3), which then dissociates into bicarbonate (HCO3-) and hydrogen ions (H+). The H+ ions make the solution more acidic. However, because CO2 is a weak base, it only produces a small amount of H+ ions and therefore has a negligible effect on the pH of the blood.
Buffering Capacity of HCO3-
Another factor is the buffering capacity of bicarbonate ions (HCO3-). HCO3- is a weak base and can combine with H+ ions to form carbonic acid, which then dissociates into CO2 and water. This process helps to remove excess H+ ions and maintain a relatively constant pH. In venous blood, the H+ ions generated from CO2 and H2O are buffered by HCO3-, which helps to maintain the pH of venous blood similar to arterial blood.
Deoxyhemoglobin as a Buffer
Finally, deoxyhemoglobin in venous blood also acts as a buffer. When hemoglobin is not bound to oxygen, it can bind to H+ ions and therefore help to remove excess H+ ions from the blood. This process helps to maintain the pH of venous blood similar to arterial blood.
Conclusion
In summary, the pH of venous blood is only slightly more acidic than arterial blood due to the weak base nature of CO2, the buffering capacity of HCO3-, and the buffering capacity of deoxyhemoglobin. These factors work together to maintain a relatively constant pH in the blood.
Community Answer
The pH of venous blood is only slightly more acid than the pH of arter...
The qstn is asking why pH of venous blood is slightly more acidic means slightly low pH..CO2 in blood forms H2CO3.. as blood is buffer soln, so pH is maintained..but as venous blood picks extra CO2 nd CO2 is acidic, so venous blood has slightly less pH thn arterial blood.. ans shld be 1 thn..
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The pH of venous blood is only slightly more acid than the pH of arterial blood because (1) CO2 is a weak base (2) There is no carbonic anhydrase in the venous blood (3) The H+ generated from CO2 and H20 is buffered by HCO3-; in venous blood (4) The H+ generated from CO2 and H20 is buffered by deoxyhemoglobin in venous blood?
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The pH of venous blood is only slightly more acid than the pH of arterial blood because (1) CO2 is a weak base (2) There is no carbonic anhydrase in the venous blood (3) The H+ generated from CO2 and H20 is buffered by HCO3-; in venous blood (4) The H+ generated from CO2 and H20 is buffered by deoxyhemoglobin in venous blood? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about The pH of venous blood is only slightly more acid than the pH of arterial blood because (1) CO2 is a weak base (2) There is no carbonic anhydrase in the venous blood (3) The H+ generated from CO2 and H20 is buffered by HCO3-; in venous blood (4) The H+ generated from CO2 and H20 is buffered by deoxyhemoglobin in venous blood? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The pH of venous blood is only slightly more acid than the pH of arterial blood because (1) CO2 is a weak base (2) There is no carbonic anhydrase in the venous blood (3) The H+ generated from CO2 and H20 is buffered by HCO3-; in venous blood (4) The H+ generated from CO2 and H20 is buffered by deoxyhemoglobin in venous blood?.
The pH of venous blood is only slightly more acid than the pH of arterial blood because (1) CO2 is a weak base (2) There is no carbonic anhydrase in the venous blood (3) The H+ generated from CO2 and H20 is buffered by HCO3-; in venous blood (4) The H+ generated from CO2 and H20 is buffered by deoxyhemoglobin in venous blood? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about The pH of venous blood is only slightly more acid than the pH of arterial blood because (1) CO2 is a weak base (2) There is no carbonic anhydrase in the venous blood (3) The H+ generated from CO2 and H20 is buffered by HCO3-; in venous blood (4) The H+ generated from CO2 and H20 is buffered by deoxyhemoglobin in venous blood? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The pH of venous blood is only slightly more acid than the pH of arterial blood because (1) CO2 is a weak base (2) There is no carbonic anhydrase in the venous blood (3) The H+ generated from CO2 and H20 is buffered by HCO3-; in venous blood (4) The H+ generated from CO2 and H20 is buffered by deoxyhemoglobin in venous blood?.
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